Algorithm

Never Ending Leetcode Q's

Solutions are available in C++17 and Java

Leetcode Question Description	#	Algorithm
Next Permutation	31	Single pass approach
LRU Cache	146	Dqueue
Sort Characters By Frequency	451	Single pass approach
Majority Element	169	Single pass approach
Cousins in Binary Tree	993	Depth First Search
Spiral Matrix	54	Single pass approach
Binary Tree Inorder Traversal	94	Iterating using Stack
Longest Increasing Path in a Matrix	329	Topological Sort (matrix)
Flood Fill	733	Depth First Search (matrix)
Find the town judge	997	Single pass approach
Remove K Digits	402	Stack approach
Search in Rotated Sorted Array	33	Binary Search
Merge Sorted Array	88	iterate in place merge
Implement Trie (Prefix Tree)	208	Trie tree
Kth Smallest Element in a BST	230	Iteration through stack
Online Stock Span	901	Iteration using weighted stack
Permutation in a string	567	Sliding window
Convert Sorted List to Binary Search Tree	109	recursive in-order
Top K Frequent Elements	347	Min Heap
Interval List Intersections	986	merge intervals
Construct Binary Search Tree from Preorder Traversal	1008	recursive
Find Largest Value in Each Tree Row	515	Queue
Edit Distance	72	Dynamic Programming
Longest Increasing Subsequence	300	Dynamic Programming with Binary Search
Meetings rooms II	253	Min Heap
Cheapest Flights Within K Stops	787	BFS
Snapshot Array	1146	Array with binary search
Serialize and Deserialize Binary Tree	297	Queue
Design Circular Queue	622	array
Fibonacci Number	509	Iterative top down
monotonic-array	896	Single pass
Trapping Rain Water	42	Dynamic Programming
Reorganize String	767	max Heap
Redundant Connection	684	depth first search
Search a 2D Matrix II	240	binary search
Search 2D Matrix	74	binary search
Find Distance in a Binary Tree	1740	DFS
Word Search II	212	trie + backtracking
Word Search	79	depth first search
Delete the Middle Node of a Linked List	2095	fast & slow pointer
Count Substrings With K-Frequency Characters	3325	Sliding Window
Palindromes - Semordnilap	0	iteration
Remove Nth Node From End of list	19	iteration
Linked List Cycle II	142	iteration, fast and slow pointer
Reverse Prefix of Word	2000	stack
Balanced Binary Tree	110	recursive
Maximum Subarray	53	Linear
Subarray with ZERO sum	001	Linear
Smallest subarray with sum greater than x	004	Linear
Best time to buy and sell stock	188	Dynamic program
All Nodes Distance K in Binary Tree	863	BFS
All Nodes Distance K from target Value	863A	BFS
Vertical Order Traversal of a Binary Tree	987	BFS
Remove Duplicates from Sorted List II	82	Linear
Remove Duplicates Sorted Array	82A	Linear
Next Greater Element	002	Linear
Indexes of Subarray Sum	003	Sliding Window
Implementing Stack Using Queue	225	using 1 queue and 2 queue
Number of Closed Islands	1254	BFS traversal